From mboxrd@z Thu Jan 1 00:00:00 1970 From: pavel@ucw.cz (Pavel Machek) Date: Sun, 26 Mar 2017 11:12:57 +0200 Subject: script to setup pipeline was Re: [PATCH v4 14/36] [media] v4l2-mc: add a function to inherit controls from a pipeline In-Reply-To: <20170312185845.5c18ffd0@vento.lan> References: <20170311101408.272a9187@vento.lan> <20170311153229.yrdjmggb3p2suhdw@ihha.localdomain> <20170311184551.GD21222@n2100.armlinux.org.uk> <1f1b350a-5523-34bc-07b7-f3cd2d1fd4c1@gmail.com> <20170311185959.GF21222@n2100.armlinux.org.uk> <4917d7fb-2f48-17cd-aa2f-d54b0f19ed6e@gmail.com> <20170312073745.GI21222@n2100.armlinux.org.uk> <20170312185845.5c18ffd0@vento.lan> Message-ID: <20170326091257.GA17728@amd> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi! > > I do agree with you that MC places a lot of burden on the user to > > attain a lot of knowledge of the system's architecture. > > Setting up the pipeline is not the hard part. One could write a > script to do that. Can you try to write that script? I believe it would solve big part of the problem. > > And my other point is, I think most people who have a need to work with > > the media framework on a particular platform will likely already be > > quite familiar with that platform. > > I disagree. The most popular platform device currently is Raspberry PI. > > I doubt that almost all owners of RPi + camera module know anything > about MC. They just use Raspberry's official driver with just provides > the V4L2 interface. > > I have a strong opinion that, for hardware like RPi, just the V4L2 > API is enough for more than 90% of the cases. Maybe V4L2 API is enough for 90% of the users. But I don't believe that means that we should provide compatibility. V4L2 API is not good enough for complex devices, and if we can make RPi people fix userspace... that's a good thing. > > The media graph for imx6 is fairly self-explanatory in my opinion. > > Yes that graph has to be generated, but just with a simple 'media-ctl > > --print-dot', I don't see how that is difficult for the user. > > Again, IMHO, the problem is not how to setup the pipeline, but, instead, > the need to forward controls to the subdevices. > > To use a camera, the user needs to set up a set of controls for the > image to make sense (bright, contrast, focus, etc). If the driver > doesn't forward those controls to the subdevs, an application like > "camorama" won't actually work for real, as the user won't be able > to adjust those parameters via GUI. I believe this can be fixed in libv4l2. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 181 bytes Desc: Digital signature URL: